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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55d6cd16d1122767d74375aebebb8ec6f8dad3fbbeba1e8299fb3f52e84fc5b' 
  AND token = 'zDM6PmzVSSEbiLOfn+yuccx4ZyB2OJSrpEMToiQyZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}